Try Our Apps


Avoid these words. Seriously.


[fish-uh-nuh-buh l] /ˈfɪʃ ə nə bəl/
adjective, Physics.
capable of or possessing a nucleus or nuclei capable of undergoing fission:
a fissionable nucleus; fissionable material.
Also, fissile.
Origin of fissionable
First recorded in 1940-45; fission + -able
Related forms
fissionability, noun
nonfissionable, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
Cite This Source
Examples from the Web for fissionable
Historical Examples
  • "There are, or were, three chief sources of fissionable ores," Harkaman said.

    Space Viking Henry Beam Piper
  • The fissionable material was too valuable for other purposes.

    Rip Foster in Ride the Gray Planet

    Harold Leland Goodwin
  • Do you know why that planet was so extensively colonized by the Federation, when there don't seem to be any fissionable ores?

    Space Viking Henry Beam Piper
  • Both uranium 235 and plutonium are fissionable and can be used to produce an atomic explosion.

    Trinity [Atomic test] Site White Sands Missile Range Public Affairs Office
  • What makes the whole thing terrible is that the freighter is loaded with fissionable material exported from Ganymede.

    Jack of No Trades Charles Cottrell
  • The neutron source, the neutron reflector, and one piece of fissionable material were in place.

    Rip Foster in Ride the Gray Planet

    Harold Leland Goodwin
British Dictionary definitions for fissionable


capable of undergoing nuclear fission as a result of any process Compare fissile (sense 1)
Derived Forms
fissionability, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Cite This Source

Word of the Day

Nearby words for fissionable

Word Value for fissionable

Scrabble Words With Friends